SquareD QO Breaker identification

I have an old SquareD breaker panel (QOC20W) from circa 1983 that I
need to get a breaker for.
The new QO breakers aren't the same QO breakers that fit inside this
box. The newer ones have a "hook" on one end and a pair of "clamps"
at the other end.
The older ones that are in this box have a pair of "clamps" at both
ends that are rotated 90 degrees from each other.
I'm looking for the part number of a tandem breaker (much like their
QOT2020's, but instead of a "hook" at one end, another pair of
"clamps".)
Any idea what to ask for and where to get it? I've scrounged all
around SquareD's ecatalog.
Thanks.

Home Depot has both kinds. The old-style 2020's are in separate
packages rather than loose in cases, and are a lot more expensive. I
believe it's only the tandem breakers that have that hook thing, and
it's to prevent you from using them in an old box (and maybe to keep you
from using too many of them in some new boxes)
Bob

I just bought a single pole 20 amp QO at Lowes for a circa 1974 house. It
had the prongs as you described.
Tandem breakers usually have a restrictive device to prevent you from
installing more than a few of them per panel box. I wasn't aware any changes
to the QO series.
Colbyt

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